在报表控件 FastReport .NET 中使用 PageCreate 事件

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FastReport .NET 是适用于.NET Core 3，ASP.NET，MVC和Windows窗体的全功能报告库。使用FastReport .NET，您可以创建独立于应用程序的.NET报告。

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新事件 PageCreate 在 FastReport .NET 引擎中创建新页面时发生。在此阶段，您可以更改页面的属性。 StartPage、FinishPage 和 ManualBuild 等其他事件在构建页面模板开始/结束之前触发。

例如，您可以在横向和纵向页面方向之间交替。或者，借助此事件，您可以创建一个单独的数据源，其中包含有关 ExportAlias 或其他页面属性的信息。在事件执行过程中，您可以设置参数，并在下一页的开头迭代数据源。

以下示例描述了使用 PageCreate 事件定义 ExportAlias 的修改后的演示报告。

<?xml version="1.0" encoding="utf-8"?>
<Report ScriptLanguage="CSharp" TextQuality="Regular" ReportInfo.Description="Demonstrates a group report. To create it:&#13;&#10;- go to "Report|Configure Bands..." menu;&#13;&#10;- press "Add" button and add a group header (this will add a data band and a group footer as well);&#13;&#10;- return to the report page, doubleclick the group header to show its editor." ReportInfo.Created="01/17/2008 04:31:41" ReportInfo.Modified="03/13/2024 17:32:59" ReportInfo.CreatorVersion="1.0.0.0">
<ScriptText>
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;
using System.Drawing;
using System.Data;
using FastReport;
using FastReport.Data;
using FastReport.Dialog;
using FastReport.Barcode;
using FastReport.Table;
using FastReport.Utils;

namespace FastReport
{
public class ReportScript
{
private void Page1_CreatePage(object sender, EventArgs e)
{
if(Data1.DataSource.RowCount == 0)
Data1.InitDataSource();
Page1.ExportAlias = Data1.DataSource["ProductName"].ToString().Substring(0,1);
}
}
}
</ScriptText>
<Styles>
<Style Name="EvenRows" Fill.Color="OldLace" Font="Arial, 10pt"/>
</Styles>
<Dictionary>
<TableDataSource Name="Products" ReferenceName="NorthWind.Products" DataType="System.Int32" Enabled="true">
<Column Name="ProductID" DataType="System.Int32"/>
<Column Name="ProductName" DataType="System.String"/>
<Column Name="SupplierID" DataType="System.Int32"/>
<Column Name="CategoryID" DataType="System.Int32"/>
<Column Name="QuantityPerUnit" DataType="System.String"/>
<Column Name="UnitPrice" DataType="System.Decimal"/>
<Column Name="UnitsInStock" DataType="System.Int16"/>
<Column Name="UnitsOnOrder" DataType="System.Int16"/>
<Column Name="ReorderLevel" DataType="System.Int16"/>
<Column Name="Discontinued" DataType="System.Boolean" BindableControl="CheckBox"/>
<Column Name="EAN13" DataType="System.String"/>
</TableDataSource>
<Total Name="TotalProducts" TotalType="Count" Evaluator="Data1" PrintOn="GroupFooter1"/>
</Dictionary>
<ReportPage Name="Page1" Watermark.Font="Arial, 60pt" CreatePageEvent="Page1_CreatePage">
<ReportTitleBand Name="ReportTitle1" Width="718.2" Height="103.95" CanGrow="true">
<TextObject Name="Text1" Top="56.7" Width="718.2" Height="47.25" Text="ALPHABETICAL PRODUCT LIST" HorzAlign="Center" VertAlign="Center" Font="Tahoma, 14pt, style=Bold"/>
<TextObject Name="Text11" Top="28.35" Width="718.2" Height="28.35" Anchor="Top, Left, Right" Fill.Color="WhiteSmoke" CanGrow="true" CanShrink="true" Text="[Report.ReportInfo.Description]&#13;&#10;" Padding="4, 4, 4, 4" Font="Tahoma, 8pt"/>
<TextObject Name="Text18" Width="718.2" Height="28.35" Anchor="Top, Left, Right" Fill.Color="WhiteSmoke" Cursor="Hand" Hyperlink.Value="http://fast.report/cda2a" Hyperlink.OpenLinkInNewTab="true" Text="Learn how to build this report on the Fast Reports Academy channel" VertAlign="Center" Font="Tahoma, 10pt, style=Bold, Underline" TextFill.Color="Blue"/>
</ReportTitleBand>
<GroupHeaderBand Name="GroupHeader1" Top="107.15" Width="718.2" Height="37.8" StartNewPage="true" KeepWithData="true" Condition="[Products.ProductName].Substring(0,1)" SortOrder="None">
<TextObject Name="Text7" Left="9.45" Width="699.3" Height="37.8" Border.Lines="All" Border.Color="LightSkyBlue" Fill="LinearGradient" Fill.StartColor="LightSkyBlue" Fill.EndColor="AliceBlue" Fill.Angle="90" Fill.Focus="0.42" Fill.Contrast="1" Text="[[Products.ProductName].Substring(0,1)]" Padding="5, 0, 0, 0" VertAlign="Center" Font="Tahoma, 12pt, style=Bold"/>
<DataBand Name="Data1" Top="148.15" Width="718.2" Height="18.9" DataSource="Products" KeepTogether="true">
<TextObject Name="Text2" Left="9.45" Width="604.8" Height="18.9" Border.Lines="Left" Border.Color="LightSkyBlue" Text="[Products.ProductName]" VertAlign="Center" Font="Tahoma, 8pt">
<Highlight>
<Condition Expression="[Row#] % 2 == 0" Fill.Color="AliceBlue" TextFill.Color="Black" Font="Arial, 10pt" ApplyFill="true" ApplyTextFill="false"/>
</Highlight>
</TextObject>
<TextObject Name="Text4" Left="614.25" Width="94.5" Height="18.9" Border.Lines="Right" Border.Color="LightSkyBlue" Text="[Products.UnitPrice]" Format="Currency" Format.UseLocale="true" Format.DecimalDigits="2" HorzAlign="Right" VertAlign="Center" Font="Tahoma, 8pt">
<Highlight>
<Condition Expression="[Row#] % 2 == 0" Fill.Color="AliceBlue" TextFill.Color="Black" Font="Arial, 10pt" ApplyFill="true" ApplyTextFill="false"/>
</Highlight>
</TextObject>
<Sort>
<Sort Expression="[Products.ProductName]"/>
</Sort>
</DataBand>
<GroupFooterBand Name="GroupFooter1" Top="170.25" Width="718.2" Height="47.25" KeepWithData="true">
<TextObject Name="Text8" Left="9.45" Width="699.3" Height="18.9" Border.Lines="Left, Right, Bottom" Border.Color="LightSkyBlue" Text="Total products: [TotalProducts]" HorzAlign="Right" VertAlign="Center" Font="Tahoma, 8pt, style=Bold"/>
</GroupFooterBand>
</GroupHeaderBand>
<PageFooterBand Name="PageFooter1" Top="220.7" Width="718.2" Height="28.35" Fill.Color="WhiteSmoke">
<TextObject Name="Text9" Left="614.25" Width="94.5" Height="28.35" Text="[PageN]" HorzAlign="Right" VertAlign="Center" Font="Tahoma, 8pt"/>
<TextObject Name="Text12" Left="9.45" Width="217.35" Height="28.35" Cursor="Hand" Hyperlink.Value="https://www.fast-report.com/en/product/fast-report-net/" Text="Generated by FastReport .NET" VertAlign="Center" Font="Tahoma, 8pt, style=Underline" TextFill.Color="Blue"/>
</PageFooterBand>
</ReportPage>
</Report>

将示例中的报表导出到 Excel 2007 的结果：

导出完成的报告的示例